Default lister font

I have somehow managed to change what I believe is called the Startup Lister. No idea how to change the font again. But, I really want to set a default font for the area where folders and files are shown (that is the lister, isn't it?). How do I change it. Have seen reference to the Folder Tree, and I may want to change the font there to, but priority now is the lister.

Help appreciated.

Hans L

Preferences / Colours and Fonts / Fonts / File display